Pineapple wrote:I was thinking about adding a switch to these, but I just took a blind flier on this programmable timer switch. I'll set it to run starting at 7:30 am for 5 hours or whatever my water supply will allow.

I had to cut the 90s shorter to get the straight pieces closer together, but you can stagger the holes in a single piece to get the same effect.

The pvc just lays on the top edge of the pads.

Then I went to the bin (16489-j "junk" subheading A "awsume") and found some handles.

Then make an air tight lid.(figure it out)

Finished cooler looks like this.

I call it the universal cooler cause you just shove the pad side against any opening in a tent, bus, travel trailer, yurt, or playpod and it will cool up to 3000 cubic feet of space. You can even set it on a table outside for use.

Add some foam stickon wheather stripping for a good seal around a window.

Fill it with 7gals. of water for 8hrs. of cooling. So once a day depending on how much you use it.

105ah battery will run this all week on low.

You may have to recharge if you use medium or high speed on the fan.

I'm confident that this will cool even a school bus without useing a genny and its a lot quieter than an air conditioner.

As always I'll try to answer any questions you may have.

(This cooler can be made more affective by widening the body enough to accept 2 vent registers. It will get more air flow and have more evap surface!)

If those number are correct, the clock draws 0.015mA, very low, just to keep track of the time. The power usage is the VA, or 0.015 x 12 VDC = 0.18 mW.

When it switches the load on, the switch needs current to do its work, so it will draw some additional current. This appears to be the published Power Consumption of 4.4VA. Here we use the I=P/V, for I = 4.4/12 = .366 A or 366mA.

If you've got up to a 24VDC fan drawing up to 16A, then you're within the published limits.

So the 12 VDC fans & pumps recommended here are within the limits, and when switched on, the current used against the battery will be the current of the fan & pump, plus the 366mA.

What I don't know, is what the voltage of the deep-cycle battery goes to as it gets used up, and if the clock/switch circuits will keep functioning if the supply voltage drops below 12 VDC. If there was a clock/switch that ran on 5VDC, you could power it from a voltage regulator running on the 12 VDC battery and this would not be an issue.

Jar Jar Sith Lord.Odd. No bears in the dump. Oh well, lets go across the road & pick blueberries..... but don't harm the red dragon that frequents the area from time to time. He and I have an agreement.

captain mcguiver wrote:You COULD use a separate battery for the clock itself. ...

If the clock/switch VCC is separate from the Switched VCC.I haven't checked to see if this is a high-side electronic switch, low-side switch electronic switch or a relay.

Checked.Four blades.Two labelled power. Hoping the published specs are good and it runs off of 12 VDC. The other two blades are labeled for both VDC and VAC, so it's likely a relay, so it should be able to go anywhere in the circuit you want a timed switch.Too bad they don't provide an internal schematic.

So if you provide a 12 VDC source for the clock/switch that has enough power for the number of times and duration it will be turned on, you should be good to go, with the deep-cycle battery and its loads running through the switch.

Jar Jar Sith Lord.Odd. No bears in the dump. Oh well, lets go across the road & pick blueberries..... but don't harm the red dragon that frequents the area from time to time. He and I have an agreement.

Damn. That's like...almost one of these every five hours. You'd need to haul a fair bit of water out to the Playa to run this thing, even just in the mornings. A daunting logistical challenge if you're ride sharing and not bringing your own large vehicle.

I don't suppose that estimate changes when we're talking about a two person tent versus a van?

"I will not fear. Fear is the mind-killer. I will face my fear. I will let it pass through me. Where the fear has gone, there shall be nothing. Only I will remain."

Essentially I'm going to do a mini box cooler. 24" high, 18" wide, 15" deep. 3 vents, two 12x14 and one 16x14. It can hold 7 gallons of water.I got these acrylic sheets, going to TAP plastics tomorrow- they charge 50 cents a cut.... thanks for posting the cooler in plywood, I might do it like that.

OK to have box cooler outside with fan in my yurt? I gather it doesn't make much of a diff if outside box is shaded...

Another Question ... they have a bank of batteries and a solar panel. They are going to supply me with a 120v AC connection through an extension chord, so it is inverted. I would have to reconvert to DC. Isn't all of that innefficient? Should I get some wire and tap straight into the batteries 12volt?

[quote="FIGJAM"]Bury the wire a couple of inches so people don't trip and yank your connections loose. [/quote]Or sweep it under a dust dune ... [img]https://sphotos-b.xx.fbcdn.net/hphotos-ash4/190118_4272759946066_247757157_n.jpg[/img]